sound/soc/samsung/odroid.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (C) 2017 Samsung Electronics Co., Ltd.
   4
   5 #include <linux/clk.h>
   6 #include <linux/clk-provider.h>
   7 #include <linux/of.h>
   8 #include <linux/of_device.h>
   9 #include <linux/module.h>
  10 #include <sound/soc.h>
  11 #include <sound/pcm_params.h>
  12 #include "i2s.h"
  13 #include "i2s-regs.h"
  14
  15 struct odroid_priv {
  16         struct snd_soc_card card;
  17         struct clk *clk_i2s_bus;
  18         struct clk *sclk_i2s;
  19
  20         /* Spinlock protecting fields below */
  21         spinlock_t lock;
  22         unsigned int be_sample_rate;
  23         bool be_active;
  24 };
  25
  26 static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
  27 {
  28         struct snd_pcm_runtime *runtime = substream->runtime;
  29
  30         snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
  31
  32         return 0;
  33 }
  34
  35 static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream,
  36                                       struct snd_pcm_hw_params *params)
  37 {
  38         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  39         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  40         unsigned long flags;
  41         int ret = 0;
  42
  43         spin_lock_irqsave(&priv->lock, flags);
  44         if (priv->be_active && priv->be_sample_rate != params_rate(params))
  45                 ret = -EINVAL;
  46         spin_unlock_irqrestore(&priv->lock, flags);
  47
  48         return ret;
  49 }
  50
  51 static const struct snd_soc_ops odroid_card_fe_ops = {
  52         .startup = odroid_card_fe_startup,
  53         .hw_params = odroid_card_fe_hw_params,
  54 };
  55
  56 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
  57                                       struct snd_pcm_hw_params *params)
  58 {
  59         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  60         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  61         unsigned int pll_freq, rclk_freq, rfs;
  62         unsigned long flags;
  63         int ret;
  64
  65         switch (params_rate(params)) {
  66         case 64000:
  67                 pll_freq = 196608001U;
  68                 rfs = 384;
  69                 break;
  70         case 44100:
  71         case 88200:
  72                 pll_freq = 180633609U;
  73                 rfs = 512;
  74                 break;
  75         case 32000:
  76         case 48000:
  77         case 96000:
  78                 pll_freq = 196608001U;
  79                 rfs = 512;
  80                 break;
  81         default:
  82                 return -EINVAL;
  83         }
  84
  85         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
  86         if (ret < 0)
  87                 return ret;
  88
  89         /*
  90          *  We add 2 to the rclk_freq value in order to avoid too low clock
  91          *  frequency values due to the EPLL output frequency not being exact
  92          *  multiple of the audio sampling rate.
  93          */
  94         rclk_freq = params_rate(params) * rfs + 2;
  95
  96         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
  97         if (ret < 0)
  98                 return ret;
  99
 100         if (rtd->num_codecs > 1) {
 101                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
 102
 103                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
 104                                              SND_SOC_CLOCK_IN);
 105                 if (ret < 0)
 106                         return ret;
 107         }
 108
 109         spin_lock_irqsave(&priv->lock, flags);
 110         priv->be_sample_rate = params_rate(params);
 111         spin_unlock_irqrestore(&priv->lock, flags);
 112
 113         return 0;
 114 }
 115
 116 static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd)
 117 {
 118         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 119         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&priv->lock, flags);
 123
 124         switch (cmd) {
 125         case SNDRV_PCM_TRIGGER_START:
 126         case SNDRV_PCM_TRIGGER_RESUME:
 127         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 128                 priv->be_active = true;
 129                 break;
 130
 131         case SNDRV_PCM_TRIGGER_STOP:
 132         case SNDRV_PCM_TRIGGER_SUSPEND:
 133         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 134                 priv->be_active = false;
 135                 break;
 136         }
 137
 138         spin_unlock_irqrestore(&priv->lock, flags);
 139
 140         return 0;
 141 }
 142
 143 static const struct snd_soc_ops odroid_card_be_ops = {
 144         .hw_params = odroid_card_be_hw_params,
 145         .trigger = odroid_card_be_trigger,
 146 };
 147
 148 /* DAPM routes for backward compatibility with old DTS */
 149 static const struct snd_soc_dapm_route odroid_dapm_routes[] = {
 150         { "I2S Playback", NULL, "Mixer DAI TX" },
 151         { "HiFi Playback", NULL, "Mixer DAI TX" },
 152 };
 153
 154 static struct snd_soc_dai_link odroid_card_dais[] = {
 155         {
 156                 /* Primary FE <-> BE link */
 157                 .codec_name = "snd-soc-dummy",
 158                 .codec_dai_name = "snd-soc-dummy-dai",
 159                 .ops = &odroid_card_fe_ops,
 160                 .name = "Primary",
 161                 .stream_name = "Primary",
 162                 .platform_name = "3830000.i2s",
 163                 .dynamic = 1,
 164                 .dpcm_playback = 1,
 165         }, {
 166                 /* BE <-> CODECs link */
 167                 .name = "I2S Mixer",
 168                 .cpu_name = "snd-soc-dummy",
 169                 .cpu_dai_name = "snd-soc-dummy-dai",
 170                 .platform_name = "snd-soc-dummy",
 171                 .ops = &odroid_card_be_ops,
 172                 .no_pcm = 1,
 173                 .dpcm_playback = 1,
 174                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 175                                 SND_SOC_DAIFMT_CBS_CFS,
 176         }, {
 177                 /* Secondary FE <-> BE link */
 178                 .playback_only = 1,
 179                 .codec_name = "snd-soc-dummy",
 180                 .codec_dai_name = "snd-soc-dummy-dai",
 181                 .ops = &odroid_card_fe_ops,
 182                 .name = "Secondary",
 183                 .stream_name = "Secondary",
 184                 .platform_name = "3830000.i2s-sec",
 185                 .dynamic = 1,
 186                 .dpcm_playback = 1,
 187         }
 188 };
 189
 190 static int odroid_audio_probe(struct platform_device *pdev)
 191 {
 192         struct device *dev = &pdev->dev;
 193         struct device_node *cpu_dai = NULL;
 194         struct device_node *cpu, *codec;
 195         struct odroid_priv *priv;
 196         struct snd_soc_card *card;
 197         struct snd_soc_dai_link *link, *codec_link;
 198         int num_pcms, ret, i;
 199         struct of_phandle_args args = {};
 200
 201         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 202         if (!priv)
 203                 return -ENOMEM;
 204
 205         card = &priv->card;
 206         card->dev = dev;
 207
 208         card->owner = THIS_MODULE;
 209         card->fully_routed = true;
 210
 211         spin_lock_init(&priv->lock);
 212         snd_soc_card_set_drvdata(card, priv);
 213
 214         ret = snd_soc_of_parse_card_name(card, "model");
 215         if (ret < 0)
 216                 return ret;
 217
 218         if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
 219                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 220                                                 "samsung,audio-widgets");
 221                 if (ret < 0)
 222                         return ret;
 223         }
 224
 225         if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
 226                 ret = snd_soc_of_parse_audio_routing(card,
 227                                                 "samsung,audio-routing");
 228                 if (ret < 0)
 229                         return ret;
 230         }
 231
 232         card->dai_link = odroid_card_dais;
 233         card->num_links = ARRAY_SIZE(odroid_card_dais);
 234
 235         cpu = of_get_child_by_name(dev->of_node, "cpu");
 236         codec = of_get_child_by_name(dev->of_node, "codec");
 237         link = card->dai_link;
 238         codec_link = &card->dai_link[1];
 239
 240         /*
 241          * For backwards compatibility create the secondary CPU DAI link only
 242          * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
 243          * Also add required DAPM routes not available in old DTS.
 244          */
 245         num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
 246                                               "#sound-dai-cells");
 247         if (num_pcms == 1) {
 248                 card->dapm_routes = odroid_dapm_routes;
 249                 card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
 250                 card->num_links--;
 251         }
 252
 253         for (i = 0; i < num_pcms; i++, link += 2) {
 254                 ret = of_parse_phandle_with_args(cpu, "sound-dai",
 255                                                  "#sound-dai-cells", i, &args);
 256                 if (ret < 0)
 257                         break;
 258
 259                 if (!args.np) {
 260                         dev_err(dev, "sound-dai property parse error: %d\n", ret);
 261                         ret = -EINVAL;
 262                         break;
 263                 }
 264
 265                 ret = snd_soc_get_dai_name(&args, &link->cpu_dai_name);
 266                 of_node_put(args.np);
 267
 268                 if (ret < 0)
 269                         break;
 270         }
 271         if (ret == 0) {
 272                 cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
 273                 if (!cpu_dai)
 274                         ret = -EINVAL;
 275         }
 276
 277         of_node_put(cpu);
 278         of_node_put(codec);
 279         if (ret < 0)
 280                 return ret;
 281
 282         ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
 283         if (ret < 0)
 284                 goto err_put_cpu_dai;
 285
 286         /* Set capture capability only for boards with the MAX98090 CODEC */
 287         if (codec_link->num_codecs > 1) {
 288                 card->dai_link[0].dpcm_capture = 1;
 289                 card->dai_link[1].dpcm_capture = 1;
 290         }
 291
 292         priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
 293         if (IS_ERR(priv->sclk_i2s)) {
 294                 ret = PTR_ERR(priv->sclk_i2s);
 295                 goto err_put_cpu_dai;
 296         }
 297
 298         priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
 299         if (IS_ERR(priv->clk_i2s_bus)) {
 300                 ret = PTR_ERR(priv->clk_i2s_bus);
 301                 goto err_put_sclk;
 302         }
 303         of_node_put(cpu_dai);
 304
 305         ret = devm_snd_soc_register_card(dev, card);
 306         if (ret < 0) {
 307                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 308                 goto err_put_clk_i2s;
 309         }
 310
 311         return 0;
 312
 313 err_put_clk_i2s:
 314         clk_put(priv->clk_i2s_bus);
 315 err_put_sclk:
 316         clk_put(priv->sclk_i2s);
 317 err_put_cpu_dai:
 318         of_node_put(cpu_dai);
 319         snd_soc_of_put_dai_link_codecs(codec_link);
 320         return ret;
 321 }
 322
 323 static int odroid_audio_remove(struct platform_device *pdev)
 324 {
 325         struct odroid_priv *priv = platform_get_drvdata(pdev);
 326
 327         snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
 328         clk_put(priv->sclk_i2s);
 329         clk_put(priv->clk_i2s_bus);
 330
 331         return 0;
 332 }
 333
 334 static const struct of_device_id odroid_audio_of_match[] = {
 335         { .compatible   = "hardkernel,odroid-xu3-audio" },
 336         { .compatible   = "hardkernel,odroid-xu4-audio" },
 337         { .compatible   = "samsung,odroid-xu3-audio" },
 338         { .compatible   = "samsung,odroid-xu4-audio" },
 339         { },
 340 };
 341 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 342
 343 static struct platform_driver odroid_audio_driver = {
 344         .driver = {
 345                 .name           = "odroid-audio",
 346                 .of_match_table = odroid_audio_of_match,
 347                 .pm             = &snd_soc_pm_ops,
 348         },
 349         .probe  = odroid_audio_probe,
 350         .remove = odroid_audio_remove,
 351 };
 352 module_platform_driver(odroid_audio_driver);
 353
 354 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 355 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 356 MODULE_LICENSE("GPL v2");